Commands by manny79

Commands by manny79 (2)

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Generate SHA1 hash for each file in a list

Alternative command for performing an sha1 hash for a given set of files matched by a wildcard Show Sample Output
This is sample output - yours may be different.
```
4cda65fe07b185f034dd877e0837942fb032eeff  cg_cuda.cu
060f137380cfd715dc038fe2486157773d893ab2  ConjugateGradient.h
b7d927e6fd78da5ac93e924824b17f25e1a93ecd  cudasolver.cpp
a736dcc1a4a8f168000951efea0f1028d6938940  cudasolver.h
e7fc11230d14bac882ccd1d14c72c79890b650cf  cuda_support.h
```
-2

sha1sum * >> SHA1SUMS

manny79 · 2010-05-05 18:14:52 0
Show GCC-generated optimization commands when using the "-march=native" or "-mtune=native" switches for compilation.

You can tell GCC to automatically select optimization commands and produce optimized code for the local machine (the one compiling the code), but you can't normally see what switches have been selected and used unless you append a "-v" and pause compilation. Show Sample Output
This is sample output - yours may be different.
```
This is the output on my AMD Athlon64 X2:

/usr/lib/gcc/i486-linux-gnu/4.3.3/cc1 -E -quiet -v - -D_FORTIFY_SOURCE=2 -march=k8-sse3 -mcx16 -msahf --param l1-cache-size=64 --param l1-cache-line-size=64 -mtune=k8
```
5

cc -march=native -E -v - </dev/null 2>&1 | grep cc1

manny79 · 2009-08-21 09:47:37 3

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Trim png files in a folder

That should be a short as it can get.

combining streams

2>&1 permit to combinate stdout and stderr. grep will catch stderr and stdout instead of stdout only.

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Count items in JSON array

Pipe any JSON to jq, then count with the appropiate expression and use the | length on the array

get function's source

no need to reinvent the wheel. Thanks to the OP for the "obsolete" hint. 'declare' may come in pretty handy on systems paranoid about "up-to-dateness"

list block devices

Shows all block devices in a tree with descruptions of what they are.

Selecting a random file/folder of a folder

Also looks in subfolders

Display / view the contents of the manifest within a Java jar file

Displays the manifest within a jar file. Can use it to confirm version number, etc.

check open ports without netstat or lsof

tar directory and compress it with showing progress and Disk IO limits

tar directory and compress it with showing progress and Disk IO limits. Pipe Viewer can be used to view the progress of the task, Besides, he can limit the disk IO, especially useful for running Servers.

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